Speed-change gear



I. H. WRIGHT.

SPEED CHANGE GEAR.

APPLICATION FILED JUNE25. 1917 Patented Jul 27, 1920.

5 SHEETS-SHEET I.

a i I I 71%? -W&%zc6 Isaac 7 M if z I. H. WRIGHT.

SPEED CHANGE GEAR.

APPLICATION FILED JUNE 25. 1917.

5 -SHEETS-SHEET 2- Patented July 27, 1920.

I. H. WRIGHT.

SPEED CHANGE GEAR. APPLICATION FILED JUNE 25, 1917.

' Patented J lily 27, 1920;

5 SHEETS-SHEET 3.

Figfl.

Fig.9.

1. H. WRIGHT SPEED CHANGE GEAR.

APPLICATION FILED JUNE 25, 19!?- Patented July 27 1920.

5 SHEETSSHEET 4.

Figlil m%es\ses l. H. WRIGHT.

SP-EED CHANGE GEAR.

APPLICATION FILED JUNE 25, 19W.

5 SHEETS$HEET 5.

I [El UNITED STATES ISAAC H. WRIGHT, OF

PATENT OFFICE.

SALFORD, ENGLAND, ASSIG-NOR T0 AND COVENTRY LIMITED, OF SALFORD,ENGLAND.

SPEED-CHANGE GEAR.

- Application filed June 25,

ments in Speed-Change Gears, of which the I following is aspecification. I 4

This invention relates to variable speed gears in which a selected speedis obtained from a constantly rotating shaft through wheels loosethereon" by means ofa key or cotter rotating with the shaft which issuccessively brought into engagement with the wheels by the longitudinalmovement of the shaft such movement being effected by a cam.

It consists essentially in the application to theprim'ary shaft ofasliding bearing or sleeve provided with two or more projecting pinsor-studs and in the particular formation of cam to engage .them thegroove therein being 'ada'ptedby successively engaging the pins to givethe required number of stations or speed variations to the gear andwhere a secondary change is required the applicationto theshaft of asecond set of gear'wheels which can be successively locked tothe'secondary shaft and 'a Gene a stop motion and pinion to give alongitudinal movement to the secondary shaft. v

' The'inventionwill b'e fully described withreference. to theaccompanying 'drawingsf Figure 1 is a'longitudinal sectionalelevation-ofthe improved gear in which the first position of theshifting cam is shown.

" Fig. 2 is a plan of the gear operating mechanism. j i I Fig. 3 is aView of the shifting cam show ing it in' its second position.

' Fig. Lisa View of the shifting cam showing it in its third position.

Fig. 5 is aview of the shifting cam showing itin-its' fourth position;

v F ig. 6 is afront elevation of mechanism for operating and setting.the. shifting" cam and the Genevasto motion.

Fig. 7 is a plan o casing of same.

Fig. 8 is a transverse sectional elevation through the shifting V cam'and mechanism for operating it. t p a 1 Fig. 9 is a part plan of theshifting-cam and sleeve bearing with six studs.

f Fig. 10 is a part} sectional elevation of the shifting cam and sleevebearing with six Specification of Letters Patent.

Patented Jul 27,1920.

1917. serial No. 176,858.

studs togive eight movements to the sleeve bearing.

Figs. 11 to 18 are diagrammaticviews of the shifting cam and sleevebearing with six studs showing them in eight successive po shaft at oneendiis fitted with a driving sleeve A mounted in a suitable bearing Cand within which over a key'c.

The sleeve A. is fitted with a pulley C or with a gear wheel by which itand'the primary shaft A are driven. 1 i

Upon the primary shaft A any number of pinions (for example four) aa a aof different diameters are loosely mounted and within aslot in theshaft'A is fitted a spring key a which will successively engage. thepinions a 0 0* as theshaft is moved longitudinally from 'one"v positionto an other. 1 1 I "The secondary shaft B is also at one end fitted witha sleeve B, mounted in-a suitable bearingiC within which it is free torotateand move longitudinally. Upon the sleeve B any number ofpinions'bb b b V a a a a on the primary shaft A and with which they gear"andlwithin a slot in. the

it can'move longitudinally shaft, B a spring key 6 is fitted to engage aslot'in the sleeve B- and through which motion from the sleeve B istransmitted to the shaft. e v

This constitutesthe primary change gear I without anyv secondary and maybe" used change gear.

For a secondary change gear a number of compound pinions D. d,'E.-e, Ff, are loosely mounted upon the'p'rimary shaft A and a number ofcompound pinions G. g, H. h,

and a pinion K are mounted loosely upon thesecondary shaft B. j Thistrain of wheels is driven from a pinion 21 attached to or forming partof the sleeve B"-on to the pinion D, from the pinion d onto G, from g onto E and so on from F on tothepinion f, each of the pinions GyH, Krotating more slowly than the preceding onethe' 'wholefconstituting aspeed reducing train of wheels, any one of lthe pinions G, H, or K beingselected to' drive or rotate the secondary shaft B by sliding itlongitudinally and bringing the spring lrey Z) into connection directlywith the sleeve Bf or with one of the pinions G,

to any desired extent. I v

The invention relates primarily to the means for imparting alongitudinal movement to the primary shaft A, and the secondary shaft 13in whichare embedded the spring keys at and Z): i

The primary shaft A is reducedin diameter at its operating end, thereduced part being journaled. in a non-rotary sliding sleeve or bearingMwhich is provided with. two or more pro ections or pro ecting studs orpins m by which it and the shaft A .withit can be moved to and frolongitu-.-

dinall'y. Ashifting disk cam N to engage and operate the studs misconstructed with a groove 02 of'suitable curved shape extendingapproximately over about 180, of arc, the ends of the groove 01 beingspaced apart to correspond with the distance apart of the studs m on thesliding bearing M or erning mechanism."

with a number of grooves an. M, '&c., to correspond with the number ofstuds m;

The disk-cam N"mayib.e-rotated by'a crank onits axle orthrough bevelgears n or automatically by some independent g0v- In the form shown inFigs. 1 to '8 the cam N'is made with. a double groove 01, ofapproximately horse shoe shape and as: the

I cam rotates it controls duringhalf a revolutiononeof the studs andpassing this engagesthe other during the other half revolution. Thus thecam on completing its cycle has moved the sliding bearing a distancefully equal to theradius of thecam and where more than two pins areemployed in excess of the radius of the cam. The cam groove WIS also sodes1gned, 1n 0OIl]l1I1C tion withthe spacing apart; of the studsorprojections m on the sliding bearing M that the revolution shallsuccessively bring the Jlrey a in the shaftA. into. engagement with the1st,, 3rd. and 4th. and then the 2nd.

j wheel, that is with a c a and a this sequence giving two "short andtwo medium movements which is mechanically better than three short andone long movement which latter wouldotherwiseoccur when returning .to'complete the cycle. The sliding movement prevents the engagement of thekey at until it is brought to rest opposite the wheel withwhich itisI-intended to, engage.

In-the form shown in Figs. 9-to 18 to give a greater movement of theprimary shaft A and a greater range of chang'e wheels say eight insteadof four, the can'rN may be made withfour grooves 71. a? pant-and thesliding sleeve Mr-with six pins or studs m "arepreferably "so arrangedthat the moveg ment of the keya in the shaft A is to each These trams ofwheels may be increased:

a sleeve bearing, in whichiit rotates. The

m -m m m m which successively engage the grooves n ton as the camrotates. The sizes of the pinionsa too and the pinions b" to Z2 and thecurves of the cams a to a 7O alternate pinion in the forward directionand to the other alternate pinion in the opposite direction to give anequal step by step I movement from the commencement of the pinion whenbrought to rest.

For operating the secondary change gear, at one'side of thecam N aprojection O is provided witha pin or stud 0 which with the periphery ofthe cam N, forms a partof a, Geneva stop mechanism the other part'orstar Pbeing secured to a pinion p engaging a rack 17' cut inthesecondary shaft 13 or in Geneva stop'gear is so .timed that eachrevolution turns the pinion 10' a sufficient dis tance to advance thesecondary shaftB and its spring key I) from one gear thereon to thenext. I 3 I By rotating the cam N in one direction a series ofincreasing speeds is obtained and transmitted to the shaft Band in thereverse direction, a series of decreasing speeds.

V .The number of speedscan be varied with slight changes inthe cam N andalsojin the Geneva stop as indicatedin Figs. 9to l8.

.An index finger B may be aifixed to'the casing or cover of the cam andGeneva stop gear with .lisks 'or dials Rf and R on the spindles of thecam N and star-wheel 0 re-. spectively to. indicate the positions ofthe" cams andgears. g v Q The final shaft B? whosespeed is subject tothe variations is connected to the secondary'shaft B by a sleeve orother'coupling which will permit of the longitudinal move ment of thelatter and may give motion to the feed train .ofgafmachine tool or tothe train which drives, the cutter or tool or the member carrying it, orto any other mechanism. 1 I i What I claim as my invention and desire toprotect by Letters Patentisz- 'j l. A" variable change speed gearing comV and adapted to be engaged with said recess of the sleeve by a shiftingmovement of the latter shaft, and a plurality of pinions of differentdiameters mounted on the sleeve of the driven shaft and corresponding tothe pinions on the drive shaft with which they are adapted to gear.

2. A variable change speed gearing comprising a longitudinally shiftabledrive shaft having bearing means a sliding bearing in which oneextremity of the drive shaft is mounted, said bearing being providedwith projecting devices, a cam disk arranged to operatively engage theprojections of said bearing, a plurality of pinions of differentdiameters loosely mounted on the said shaft, the drive shaft havingmeans to successively engage the pinions thereon, a slidable drivenshaft, a sleeve mounted on said driven shaft and provided with means toengage the latter to transmit motion from the sleeve to the drivenshaft, a plurality'of pinions of different diameters mounted on thesleeve of the driven shaft and corresponding to and adapted to en agethe pinions on the drive shaft, and a 'eneva wheel for cooperating withthe said cam disk controlling the shifting movement of the drive shaft.

3.'A variable change speed gearing, comprising a longitudinally movabledrive shaft, a plurality of gears of different diameters loosely mountedon said drive shaft, means on the drive shaft to successively engage andoperatively connect the said gears thereto, a slidable driven shaft, asleeve mounted on the driven shaft, gears fixed to the sleeve andmeshing with the driving shaft gears, a secondary change gearingincluding a plurality of gears drivingly connected in series, a portionof the latter change gears being freely mounted on the driven shaft andone thereof being secured to said driven sleeve, means carried by saiddriven shaft to successively engage and operatively connect said lastnamed gears thereto, and shifting means for said shafts.

In testimony-whereof I have hereunto set my hand, in presence of twosubscribing witnesses, this 24th day of May, 1917.

' ISAAC H. WRIGHT.

Witnesses:

I. OWDEN OBRIEN, GEO. H. OBmnN.

